Automatic elevator-gate lock.



a. WILSON. AUTOMATIC ELEVATOR GATE LOCK.

APPLICATION FILED APR- 22. I915.

Patented Nov. 9, 1915.

2 SHEETS-SHEET 2.

j 2 WITN555 I barren ra rnrtr onion.

ROBERT WILSON, F HAMILTON, ONTARIO, CANADA, ASSIGNOR TO OTIS-FENSOMEILEVATGB, COMPANY, LIMITED, OF TORONTO, CANADA.

AUTOMATIC ELEVATOR-GATE LOCK.

Specification of Letters Patent.

latentedhlov. a, rare.

' Application filedApril 22, 1915. Serial No. 23,068.

To all whom it may concern Be it known that I, Bonner VVLLsoN, of

. worth, in theProvince of Ontario, Canada,

' provements have invented certain new and useful Imin AutomaticElevator-Gate Locks, of which the followingv is the specification.

My invention relates to improvements in automatic elevator gate locksand the object of the invention is to devise a lock which will insure ofthe gate being held in its raised position without danger of beingaccidentally released by lateral movement of the elevator platform andit consists essentially of a cam shoe carried by the elevator platform,a spring held latch carried by the side guide post of the elevator gate,a cam lever also carried by the post and spring held outwardly in thepath of the cam shoe, a projecting finger extending from such leveragainst the latch whereby the latch is carried into the path of the gatecounterweight when the cam lever is engaged by the cam shoe, suchcounterweight having an upwardly presented portion extending beneath thelatch when in the engaged position as hereinafter more particularlyexplained by the following specification.

Figure 1, is a view in elevation of the side guide posts and elevatorgate held therebetween and broken away intermediate of its length, theposts being partially broken away and in section to exhibit a portion ofthe interior mechanism. Fig. 2, is a vertical section through Fig. 1taken through the gate and through the locking mechanism showing aportion of the platform and the cam shoe carried thereby out ofengagement with the locking mechanism. Fig. 3, is a similar view to Fig.2 showing the cam shoe in engagement with the locking mechanism. Fig. 4,is a similar View to Figs. 2 and 3 showing the cam shoe in engagementwith the locking mechanism and the elevator gate in the raised position.Fig. 5, is an enlarged sectional detail of the locking mechanism. Fig.6, is a. front elevation of the locking mechanism as shown in Fig. 5.Fig. 7, is a perspective detail of one of the pulley blocks forsupporting the gate.

In the drawings like letters of reference indicate corresponding partsin each figure.

l and 2 indicate the side guide posts of the elevator gate.

8 indicates the elevator gate slidably carried on angle bars indicatedby the numeral 4.

5 indicates a portion or we elevator plat form.

5* indicates the floor level and 6 the ceiling level.

6 indicates a cam shoe secured to the platform 5, such shoe beingprovided with a vertical face indicated by the numeral 7 locatedadjacent to the side guide ost 2. The side guide posts 1 and 2 are holow so as to form vertical ways. i

8 indicate the counterweignts of the elevator gate 3.

9 indicate cords connected at one end to the weights 8 and at theopposite end to the elevator gate 3.

10 indicate brackets in which the pulleys indicated by the numeral 11are journaled. The brackets 10 are provided with a fiat horizontallyextending portion indicated by the numeral 12.

13 indicates a slot iormed in the horizontal portion 12. The cords 9pass over the pulleys 11 being supported thereby.

14 indicates a slot formed in the side guide post 2.

15 indicates a casting secured to the face of the post 2 and provided inproximity to its upper end with lugs 16 (see Figs. 5 and 6) and inproximity to its lower end With lugs 17.

18 and 19 indicate pins extending through and secured within the lugs 16and 17.

20 indicates a cam lever swung in. proximity to its upper end upon thepin 18.

21 indicates a recess formed in the casting 15 and 22 indicates a teatextending from the cam lever 20.

23 indicates a spiral spring fitting Within the recess 21 at one end andextending around the teat at the opposite end so as to hold the camlever 20 in a normal outward position.

24 indicates a lever extension extending upwardly therefrom above thepin 18. The

' of the inwardly projecting finger 26. If the elevator platform stopsat the floor level indicated by the numeral 5 the latch piece is held ina horizontal position. The elevator from the counter weight 8.

extension 24; bears against the face of the casting 15 when the camlever 20 is in its outermost position thereby limiting the outwardmovement of the lever. The outer face indicated by 2 5 of the lever 20is suit-o ably curved so as to form a cam surface.

26 indicates a projecting finger which extends inwardly' from the lever25.

27 indicates a latch piece swung upon a pin 19.

28 indicates a spring which is Wound around the hub of the latch piece27, one end indicated by 29 extending upwardly and bearing against asuitable portion of the casting 15 and the opposite end indicated by 30extending upwardly and bearing against the under face of the latch piece27.

31 indicates tooth projections extending 32 indicates a block throughwhich the cord 9 extends, the block being secured in position on thecord by a knot indicated by the numeral 33 formed in the cord beneaththe weight.

34 indicates a spiral spring surrounding the cord 9 above the weight 32and carried by-the weight.

Having described the principal parts involved in my invention 1 willbriefly describe the operation of the same.

When tle elevator platform is traveling downwardly in the direction ofarrow (see Fig. 2) the portion 7 of thecam shoe-engages the cam lever 20swinging it inwardly into the position shown in Fig. 3, against theoutward pressure of the compression spring 23 and thereby forcing thelatch piece 27 into a horizontal position by means gate 3 is then raisedthereby allowing the counterweight 8 to drop, the teeth of thecounterweight passing the latch piece 27, such latch iece being swungdownwardly from a horizontal position against the tension of the spring28. As soon as the tooth projection 31 is passed the latch piece fliesup again into engagement with the finger 26 holding the latch piece inthe horizontal position above the tooth 31. 'In the drawing two teeth 31are shown in order that if one tooth should miss the other one wouldengage.

It has been found that in all automatic locks the great detriment hasbeen that they are very easily freed by a very slight lateral movementof the elevator platfoipi carrying the cam shoe 6 away from thesideguide post and causing the sudden dropping of the elevator gate which isoften the cause of accident to persons who may be passing beneath thegate at the time. In my construction the locking mechanism is so formedspring 34: hereinbefore described which en gages at its upper end withthe bottom face of the horizontal extension 12 of the bracket 10 whenthe gate comes to its closed position and therefore breaks the fall ofthe gate.

' From this description it will be seen that l have devised a verysimple form of locking mechanism which will look a gate in a positivelyopen position when the gate is raised and the platform is at the floorlevel and which cannot be released until the platform leaves such floorlevel. I

What I claim as my invention is:

1.;The combination with a cam shoe carried by an elevator platform andelevator gate counterweight having an upwardly presented engaging face,of a suitably supported spring held latch designed to be swung inwardlyabove the engaging face of. the counterweight, a spring pressed camlever swung upon a suitable support and projecting into thepath of thecam shoe, and a finger extending inwardly from the cam lever against thelatch.

2. The combination with a cam shoe carried by an elevator platform andelevator gate counterweight having tooth like projections, of a suitablysupported .spring held latch designed to be swung inwardly into the pathof the tooth like projections, a spring pressed cam le er swung upon asuit able support and projecting into the path of the cam shoe, and afinger extending inwardly from the cam lever against the latch.

3. In an elevator gate locking mechanism,

the combination withja cam shoe carried by *the elevator platform andelevator gate counterweight provided with an upwardly presented engagingface, of. a suitably supported latch, a spring pressed cam lever, andmeans operated by the'engagement of the cam shoe with the cam lever forcarrying the latch into the path of the engaging face of the counterweight.

4:. In a device of the class described, a latch piece swung upon asuitable support, and a cam lever also swung upon the sup port andprovided with a finger projecting forwardly against the latch piecewhereby the latch piece is forced into a horizontal position when thecam lever is swung down.

5. In an automatic elevator gate lock, the combination with the gatecounterweight having an upwardly presented engaging against the latch tocarry it into the path of face, of a suitably supported spring held theengaging face of the counterweight.

latch, a suitably swung-lever provided with ROBERT WILSON. a fingerbearing against the aforesaid latch, Witnesses: v

5 and means operated by the descent of the RICHARD BUTLER, elevator forforcing the lever inwardly MARY FOUNDY.

(ioyies of this patent may. be obtained for five cents each, byaddressing the Commissioner of. Patents,

- Washington, D. O.

